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Compute L1 distance between matrices in fast way

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nedo nodo
nedo nodo 2012-12-20
Hi,
I have to compute the L1 distance (Manhattan distance) between matrices. Is there a fast way that avoid to use for loop? I have found this code for euclidean distance
if true
aa=sum(a.*a,2); bb=sum(b.*b,2); ab=a*b';
d = sqrt(abs(repmat(aa,[1 size(bb,1)]) + repmat(bb',[size(aa,1) 1]) - 2*ab));
end
Thank you
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Walter Roberson
Walter Roberson 2012-12-20
Jan, put your cursor on the text entry box without anything selected, and press the {} Code button...
Jan
Jan 2012-12-21
@Walter: Thank you very much. This is revelation.

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Matt J
Matt J 2012-12-20
norm(a-b,1);
  2 个评论
nedo nodo
nedo nodo 2013-1-30
|monospacedYour solution works only if a,b have the same dimension. If a is a matrix and b is a vector how can I do?
My idea is: N=sum((abs(bsxfun(@minus,A,B)).^p),2).^(1/p);
Thank you

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